Map 1. Hydrographical basin of the Upper Mississippi River from astronomical and barometrical observations surveys and information ... -- 2. Map to illustrate an exploration of the country, lying between the Missouri River and the Rocky Mountains, on the line of the Nebraska or Platte River ... -- 3. Map of an exploring expedition to the Rocky Mountains in the year 1842 and to Oregon & North California in the years 1843-44 -- 4. Topographical map of the road from Missouri to Oregon commencing at the mouth of the Kansas in the Missouri River and ending at the mouth of the Wallah Wallah in the Columbia [in seven sections] ... 5. Map of Oregon and Upper California from the surveys of John Charles Frémont and other authorities ..